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It is worth noting that the geometric error of the cutting tool has a great influence on the machining accuracy, and the influence of different types of cutting tools on the machining accuracy is not the same. The forming tool with fixed size cutting tool has a direct influence on the machining accuracy, while for ordinary cutting tools (such as turning), the machining error has no direct influence on the machining accuracy.

In the cutting process, any tool will inevitably wear, which will lead to the change of the size and shape of the workpiece. The size wear of cutting tools can be effectively reduced by selecting suitable tool material and new wear-resistant tool material from second-hand lathe, reasonable selection of tool geometric parameters and cutting parameters, selection of suitable blade grinding tools and selection of suitable coolant. According to the need, the compensation device can also be used to realize the automatic compensation of tool size wear.

Secondly, the geometric error of the fixture will also affect the accuracy of the machine tool. The function of professional maintenance CNC machine tool is to make the workpiece and cutter and machine tool have equivalence, so the manufacturing error of fixture has a great influence on the machining accuracy (especially the positioning accuracy) of workpiece.